"We know that during sleep our body's cells repair themselves, growth hormones are released, our minds processes information, and we re-energize."Source: Helium
Yes, with that fact about our brain processes information when we sleep, it's bad to do last minute revisions when that particular information is widely spread and there's a need to know a lot. (Unless your brain requires no-sort of any particular energy to work.)
Basically with early revisions, whatever information you have captured during the consciousness state will be processed into the deeper region of the brain during sleep. You will realize that the next day when you wake up, you have no problems answering a question that was supposedly alien.
Well, that is how I am able to learn the basics of Korean and Japanese. Day by day, as more sleeps are introduced, I am able to know better of all these basics.
